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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | ---
Financial assets [Abstract] |  |
Securities available for sale | $ 1,827,273 | $ 1,469,249
Securities held to maturity | 594,423 | 632,574
Financial liabilities [Abstract] |  |
Long-term debt | 92,497 | 92,460
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 67,293 | 773,830
Securities available for sale | 1,555 | 1,125
Securities held to maturity | 0 | 0
Total securities | 1,555 | 1,125
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 20,902 | 17,199
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,637,167 | 2,167,522
Interest bearing demand deposits, savings, and money markets | 151,971 | 136,568
Certificates of deposit | 0 | 0
Deposits, Wholesale, Non-Maturing | 21,923 |
Total deposits | 2,811,061 | 2,304,090
Advances from Federal Home Loan Bank | 0 | 0
Federal fund purchased |  | 992,000
Securities sold under agreements to repurchase | 0 | 0
Long-term debt | 0 | 0
Trust Preferred Securities | 0 | 0
Subordinated debentures | 0 | 0
Accrued interest payable | 722 | 875
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Securities available for sale | 1,825,718 | 1,468,124
Securities held to maturity | 594,423 | 632,574
Total securities | 2,420,141 | 2,100,698
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Federal Home Loan Bank stock | 25,043 | 47,512
Accrued interest receivable | 0 | 0
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 0 | 0
Interest bearing demand deposits, savings, and money markets | 0 | 0
Certificates of deposit | 60,689 | 125,772
Deposits, Wholesale, Non-Maturing | 0 |
Total deposits | 60,689 | 125,772
Advances from Federal Home Loan Bank | 7,891 | 108,168
Federal fund purchased |  | 0
Securities sold under agreements to repurchase | 1,848 | 3,039
Long-term debt | 1,980 | 2,018
Trust Preferred Securities | 10,446 | 10,437
Subordinated debentures | 75,375 | 77,250
Accrued interest payable | 0 | 0
Level 3 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Securities available for sale | 0 | 0
Securities held to maturity | 0 | 0
Total securities | 0 | 0
Loans receivable [Abstract] |  |
Total loans receivable | 1,141,191 | 926,803
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 0 | 0
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 0 | 0
Interest bearing demand deposits, savings, and money markets | 0 | 0
Certificates of deposit | 0 | 0
Deposits, Wholesale, Non-Maturing | 0 |
Total deposits | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Federal fund purchased |  | 0
Securities sold under agreements to repurchase | 0 | 0
Long-term debt | 0 | 0
Trust Preferred Securities | 0 | 0
Subordinated debentures | 0 | 0
Accrued interest payable | 0 | 0
Carrying Amount [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 67,293 | 773,830
Securities available for sale | 1,827,273 | 1,469,249
Securities held to maturity | 596,803 | 619,853
Total securities | 2,424,076 | 2,089,102
Loans receivable [Abstract] |  |
Total loans receivable | 1,152,382 | 925,894
Federal Home Loan Bank stock | 25,043 | 47,512
Accrued interest receivable | 20,902 | 17,199
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,637,167 | 2,167,522
Interest bearing demand deposits, savings, and money markets | 151,971 | 136,568
Certificates of deposit | 61,170 | 125,992
Deposits, Wholesale, Non-Maturing | 21,923 |
Total deposits | 2,872,231 | 2,430,082
Advances from Federal Home Loan Bank | 7,000 | 107,000
Federal fund purchased |  | 992,000
Securities sold under agreements to repurchase | 1,848 | 3,039
Long-term debt | 1,980 | 2,018
Trust Preferred Securities | 10,310 | 10,310
Subordinated debentures | 73,278 | 73,211
Accrued interest payable | 722 | 875
Estimated Fair Value [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 67,293 | 773,830
Securities available for sale | 1,827,273 | 1,469,249
Securities held to maturity | 594,423 | 632,574
Total securities | 2,421,696 | 2,101,823
Loans receivable [Abstract] |  |
Total loans receivable | 1,141,191 | 926,803
Federal Home Loan Bank stock | 25,043 | 47,512
Accrued interest receivable | 20,902 | 17,199
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,637,167 | 2,167,522
Interest bearing demand deposits, savings, and money markets | 151,971 | 136,568
Certificates of deposit | 60,689 | 125,772
Deposits, Wholesale, Non-Maturing | 21,923 |
Total deposits | 2,871,750 | 2,429,862
Advances from Federal Home Loan Bank | 7,891 | 108,168
Federal fund purchased |  | 992,000
Securities sold under agreements to repurchase | 1,848 | 3,039
Long-term debt | 1,980 | 2,018
Trust Preferred Securities | 10,446 | 10,437
Subordinated debentures | 75,375 | 77,250
Accrued interest payable | 722 | 875
1-4 Family Real Estate [Member] | Level 1 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
1-4 Family Real Estate [Member] | Level 2 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
1-4 Family Real Estate [Member] | Level 3 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 176,879 | 163,886
1-4 Family Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 178,310 | 162,298
1-4 Family Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 176,879 | 163,886
Commercial and Multi-family Real Estate Loans [Member] | Level 1 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Commercial and Multi-family Real Estate Loans [Member] | Level 2 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Commercial and Multi-family Real Estate Loans [Member] | Level 3 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 464,071 | 422,307
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 473,058 | 422,932
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 464,071 | 422,307
Agricultural Real Estate [Member] | Level 1 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Agricultural Real Estate [Member] | Level 2 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Agricultural Real Estate [Member] | Level 3 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 58,829 | 63,868
Agricultural Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 62,422 | 63,612
Agricultural Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 58,829 | 63,868
Consumer Loans [Member] | Level 1 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Consumer Loans [Member] | Level 2 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Consumer Loans [Member] | Level 3 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 181,687 | 36,738
Consumer Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 182,156 | 37,094
Consumer Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 181,687 | 36,738
Commercial Operating Loans [Member] | Level 1 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Commercial Operating Loans [Member] | Level 2 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Commercial Operating Loans [Member] | Level 3 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 34,004 | 31,108
Commercial Operating Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 33,894 | 31,271
Commercial Operating Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 34,004 | 31,108
Agricultural Operating [Member] | Level 1 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Agricultural Operating [Member] | Level 2 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Agricultural Operating [Member] | Level 3 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 35,394 | 36,897
Agricultural Operating [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 35,493 | 37,083
Agricultural Operating [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 35,394 | 36,897
Premium Finance Loans [Member] | Level 1 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Premium Finance Loans [Member] | Level 2 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Premium Finance Loans [Member] | Level 3 [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 190,327 | 172,000
Premium Finance Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 187,049 | 171,604
Premium Finance Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | $ 190,327 | $ 172,000

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